وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ كَانَ يَقُولُ لاَ تُنْكَحُ الأَمَةُ عَلَى الْحُرَّةِ إِلاَّ أَنْ تَشَاءَ الْحُرَّةُ فَإِنْ طَاعَتِ الْحُرَّةُ فَلَهَا الثُّلُثَانِ مِنَ الْقَسْمِ ‏.‏ قَالَ مَالِكٌ وَلاَ يَنْبَغِي لِحُرٍّ أَنْ يَتَزَوَّجَ أَمَةً وَهُوَ يَجِدُ طَوْلاً لِحُرَّةٍ وَلاَ يَتَزَوَّجَ أَمَةً إِذَا لَمْ يَجِدْ طَوْلاً لِحُرَّةٍ إِلاَّ أَنْ يَخْشَى الْعَنَتَ وَذَلِكَ أَنَّ اللَّهَ تَبَارَكَ وَتَعَالَى قَالَ فِي كِتَابِهِ ‏{‏وَمَنْ لَمْ يَسْتَطِعْ مِنْكُمْ طَوْلاً أَنْ يَنْكِحَ الْمُحْصَنَاتِ الْمُؤْمِنَاتِ فَمِمَّا مَلَكَتْ أَيْمَانُكُمْ مِنْ فَتَيَاتِكُمُ الْمُؤْمِنَاتِ‏}‏ وَقَالَ ‏{‏ذَلِكَ لِمَنْ خَشِيَ الْعَنَتَ مِنْكُمْ‏}‏ قَالَ مَالِكٌ وَالْعَنَتُ هُوَ الزِّنَا ‏.‏

Yahya related to me from Malik from Yahya ibn Said that Said ibnal-Musayyab said, "The slave girl is not married when there is a freewoman who is a wife unless the free woman wishes it. If the free womancomplies, she has two-thirds of the division of time." Maliksaid, "A free man must not marry a slave-girl when he can afford tomarry a free-woman, and he should not marry a slave-girl when hecannot afford a free woman unless he fears fornication. That isbecause Allah, may he be Blessed and Exalted, says in His Book, 'Ifyou are not affluent enough to marry believing women, who aremuhsanat, take slave-girls who are believing women that your righthands own.' (Sura 4 ayat 24) He says, 'That is for those of you whofear al-anat.' " Malik said, "Al-anat is fornication." Translation Not Available

Book Ref: Muwatta Imam Malik Book 28 Hadith 1123
Web Ref:  Muwatta Imam Malik Book 28 Hadith 29